package com.media.Filter;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

@WebFilter(filterName = "LoginFilter")
public class LoginFilter implements Filter {
    String[] ignores;
    public void destroy() {
    }

    public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws ServletException, IOException {
        HttpServletRequest request =(HttpServletRequest) req;
        HttpServletResponse response = (HttpServletResponse) resp;
        HttpSession session = request.getSession();
        String uri =request.getRequestURI();
        if (session.getAttribute("username") !=null || isIgnore(uri)){
            chain.doFilter(request, response);
        }else{
            response.sendRedirect("login.jsp");
        }
    }
    private boolean isIgnore(String uri){
        for (String str:ignores){
            if (uri.indexOf(str)!= -1){
                return true;
            }
        }
        return false;
    }
    public void init(FilterConfig config) throws ServletException {
        String ignore =config.getInitParameter("ignore");
        ignores=ignore.split(",");

    }

}
